1. Department of Internal Medicine, Hallym University College of Medicine, Seoul, Korea.
2. Hallym University Kidney Research Institute, Seoul, Korea.
3. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
4. Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
5. Truewords Dialysis Clinic, Incheon, Korea.
6. Department of Internal Medicine, Kangbuk Samsung Hospital, Seoul, Korea.
7. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
8. Department of Internal Medicine, Busan Paik Hospital, Busan, Korea.
9. Preventive and Management Center, Inha University Hospital, Incheon, Korea.